"The relationship between the firms the NRA employed and the firms the Trump Campaign and other Republican candidates used suggests illegal coordination," they wrote in the letter dated Wednesday.

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The letter notes that "the NRA spent over $50 million on 'independent' expenditures" that supported Republican candidates, including Trump, during the 2016 election.

The Democratic lawmakers are requesting a series of documents from the NRA by March 6, including emails with five media consulting firms and the names of employees they communicated with at the companies.

They separately noted in letters to the companies that "a payment for a coordinated communication is an in-kind contribution to a candidate," adding, "the NRA may have violated contribution limits under the Federal Election Campaign Act by making coordinated communications in excess of applicable contribution caps."

The NRA did not immediately respond to a request for comment from The Hill on Thursday.

NEWS: Proud to partner with @SenWhitehouse to demand answers from the NRA on whether there was a deliberate effort by the NRA & its agents to coordinate with the Trump campaign & other candidates in violation of campaign finance laws. Congress deserves answers. https://t.co/5ll3sZ6eFc